G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00

G01R1/02—General constructional details

G01R1/18—Screening arrangements against electric or magnetic fields, e.g. against earth's field

G—PHYSICS

G01—MEASURING; TESTING

G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES

G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00 and G01R33/00 - G01R35/00

G01R15/04—Voltage dividers

G—PHYSICS

G01—MEASURING; TESTING

G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES

G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof

H—ELECTRICITY

H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER

H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES

H02G5/00—Installations of bus-bars

H02G5/06—Totally-enclosed installations, e.g. in metal casings

H02G5/066—Devices for maintaining distance between conductor and enclosure

Abstract

The present invention relates to a kind of medium-pressure or high pressure device with cable connecting terminals and voltage sensor, wherein the voltage sensor has resistive voltage divider (3,5) and bucking electrode (10,11).In order to strengthen the voltage measurement degree in medium-pressure or high pressure stem portion, voltage sensor is applied to voltage sensor module, it is integrated in another cable connecting terminals, and the bucking electrode for voltage sensor module integration section or terminal insulating housing portion integration section.

Description

Medium-pressure or high pressure device with cable connecting terminals

Technical field

The present invention relates to a kind of medium-pressure or high pressure device with cable connecting terminals and voltage sensor, wherein the electricity
Pressure sensor has resistive voltage divider and bucking electrode.

Background technology

It is known to be used for voltage measurement and/or for protection purpose using the equipment of resistive and/or capacitive voltage divider.This
Kind medium-pressure or high pressure level operation equipment, be likely to be exposed at strong electric field, the electric field is placed on very close attached
Closely, mainly low-power export in the case of may influence measurement amount, on the insulating material or this kind equipment surface
On may introduce high dielectric stress.In the case of outdoor mounted, under conditions of rainy or humidity, this may change electric field
Distribution thereby results in the error of the voltage level of measurement, either causes increased part in corona or the equipment in equipment surface
Discharge level, it is observed that further influence.

Divider includes insulator, and it is accommodated, and one end is connected to high pressure and the other end is connected to the high pressure of low-voltage impedance
Impedance.Low-voltage impedance needs to be connected to ground.The output of this impedance potential divider is completed by two wires and/or cable.

The shortcomings that this simple measurement apparatus is the electricity that measurement is easier to be influenceed and thus may changed by parasitic capacitance
The accuracy of pressure, to protect and/or measuring the value that purpose provides inaccuracy.

Most of known voltage sensors are using always for application-specific and for voltage sensor size and using
The particular mask electrode of principle design.General impedance divider has insulator, and it accommodates one end and is connected to high pressure and another
One end is connected to the impedance of low-voltage impedance.Both high pressure impedance and low-voltage impedance form the divider with given intrinsic standoff ratio.Point
Depressor is connected by ground and is grounded.Output lead is passed through from cable, and the cable is shielded to minimize external field to through described
The influence of the low-voltage signal of output lead.In order to reduce the capacitive pickoff from external voltage source or field, bucking electrode, which surrounds, to be divided
Depressor uses.

Except external action, bucking electrode improves the Electric Field Distribution in insulator surface or insulator, set so as to realize
Standby higher dielectric tolerance level.

Minimize the sensitiveness of divider using bucking electrode, the divider is towards to high pressure or to being connected to height
The external connection of other surrounding devices of potential.

The content of the invention

It is an object of the present invention to strengthen the voltage measurement degree at middle pressure and/or high-tension apparatus.

This problem solves by the invention by the following manner, and the voltage sensor is applied to voltage sensor mould
Block, it is integrated in another cable connecting terminals, and the bucking electrode for voltage sensor module integration section or
The integration section of the insulating housing portion of terminal.Thus, voltage measurement can be occurred with high accuracy.

In another Advantageous embodiments, the bucking electrode is used in electricity with different cone shapes in the following manner
The low pressure of resistive divider and high-pressure side, i.e. bucking electrode are more than the bucking electrode in high-pressure side in the opening diameter of low-pressure side
Opening diameter.

Favourable specific embodiment is that another cable connecting terminals housing at least includes having in inner surface in the following manner
The opening of cone shape, i.e. cone diameter increase from internal to external, and at least the inner surface of circular cone covered with conductive layer or
Semiconductor layer, and the resistive voltage sensor divider is positioned in the following manner, i.e., and described high-pressure side is placed on
The side with smaller internal diameter of terminal openings, and the high-pressure side is placed on the larger diameter of terminal shell opening.It is logical
Cross this alternative embodiment, it is possible to, if the inner surface of terminal openings is covered with as a type of integrated shielding electricity
The conductive layer of pole, then discard individual screen element.This electrode layer can also be located inside terminal shell or in its periphery
In length.

In another advantageous embodiment, another cable connecting terminals, which are adjacent to, is applied to switchgear or other high pressures
Or the cable terminal of the operation cable connection of middle pressure device, such as in the output section side of stem portion.

Still further advantageous embodiment is that the voltage sensor module is electrically connected to another cable connecting terminals.

Still further advantageous embodiment is that the voltage sensor is applied to voltage sensor module, and it is integrated in another electricity
In cable connection terminal, and the bucking electrode is the integration section of the voltage sensor module or the insulation shell of terminal
Partial integration section, and substitutional resistance divider, only low pressure and high-field electrode are applied to voltage sensor purpose.

Still further advantageous embodiment is that the high-tension shielding electrode and the low pressure bucking electrode are arranged relative to each other,
Thus they are overlapping at least in part.This causes the degree of accuracy of voltage measurement to further enhance.

Brief description of the drawings

Fig. 1 shows the arrangement of an advantageous embodiment according to the present invention；

Fig. 2 shows the arrangement of another advantageous embodiment according to the present invention；With

Fig. 3 shows bucking electrode to electric parameter and the effect of the output signal of impedance potential divider.

Embodiment

The advantageous embodiment of the present invention is shown in Fig. 1 and Fig. 2.

In fig. 2, the invention suggestion of proposition uses bucking electrode, and wherein top shielding electrode 10 has cone shape, should
Cone shape increases along its axle from a distance from resistive voltage divider 3.This is reduced with the potential inside resistive voltage divider
Consistent.Because this electrode 10 designs, the constant electric stress of the insulating materials between electrode 10 and resistor 3 is realized.Under
Portion's bucking electrode 11 also has cone shape, but positioned at the opposite direction with upper electrode 10.

There is maximum gauge L identical or relatively low compared with the maximum gauge K of upper electrode 10 in underlying shield electrode 11
When, realize the optimal dielectric of independent column isolator shape for divider main body 2 and most accurate result.In this situation
In, design is optimized to be shielded by high-field electrode 10 as much as possible by this way, and high-pressure system is arrived to minimize to come from
Connection parasitic capacitance effect.

The other of such as cable terminal of system are integrated into not as autonomous device in the application of resistive voltage divider
When in part, the underlying shield electrode 11 for being connected to earth potential is allowed than the upper electrode 10 for being connected to high-voltage potential to be more preferable more greatly
's.Fig. 1 shows this configuration with HV Terminal 20.

Minimum phase error can by smaller electrode is at least partially disposed in the inside of larger electrode and at them it
Between keep distance B enough to realize.

Another embodiment can be without using resistive voltage divider.But voltage measuring apparatus is made up of and not had bucking electrode
There is resistive voltage divider, thus voltage measuring apparatus is based only upon bucking electrode, so as to form a kind of capacitive voltage divider.

In addition, if the inner surface of the terminal openings of insulator will be coated in the inner surface with conductive material,
Bucking electrode in capacitive measurement and resistive measurement both of these case can go out of use, as independent shielding element.

Still further advantageous embodiment is that the voltage sensor is applied to voltage sensor module, and it is integrated in another electricity
In cable connection terminal, and the bucking electrode is the integration section of the voltage sensor module or the insulation shell of terminal
Partial integration section, and the bucking electrode be used to indicate for the voltage of voltage detecting purpose, and voltage sensor
Module is used for voltage measurement purpose.

Another embodiment is that the high-tension shielding electrode and the low pressure bucking electrode are arranged relative to each other, thus
They are externally overlapping at least in part.

Provided in another improvement, when using high-field electrode when, the shape of the opening be not circular cone but ellipse or
It is parabola shaped.

Another to be improved to, the end of each electrode is the circle with 0.1 millimeter of least radius.

It is also advantageous that the electrode is at least partly made up of the conductive material that can distribute potential.

Last important improvement is, when the intrinsic standoff ratio and resistive division of the capacitive character resistance created by bucking electrode
When the resistor R1 and R2 of device intrinsic standoff ratio matching, minimum phase error is realized.

Fig. 3 describes bucking electrode to electric parameter and the effect of the output signal of impedance potential divider.In resistive division
In the case of device, resistor R1 and R2 are selected to achieve required partial pressure (conversion) ratio in one way.It is incorporated into circuit
Any electric capacity causes output signal compared to the phase error (displacement) of (input) signal measured.Ce electric capacity is mainly by shielding electricity
The shape of pole (if you are using) and position influence.Ccable electric capacity is mainly caused by the electric capacity of cable 8.By electric capacity Ce and
When the intrinsic standoff ratio of reactance caused by Ccable matches with resistor R1 and R2 intrinsic standoff ratio, minimum phase error is realized.

Claims (10)

1. a kind of medium-pressure or high pressure device with cable connecting terminals and voltage sensor, wherein, medium pressure or high press fitting
Put has resistive voltage divider and screen including isolator, bus, sleeve pipe, cable terminal or stem portion, the voltage sensor
Cover electrode, it is characterised in that

The voltage sensor is applied to voltage sensor module, and it is integrated in another cable connecting terminals, and described
Bucking electrode is the integration section of the voltage sensor module or the insulating housing portion of another cable connecting terminals
Integration section,

And the bucking electrode is used in the low pressure and height of resistive voltage divider with different cone shapes in the following manner
Side is pressed, i.e., described bucking electrode is more than the bucking electrode on high-tension side opening diameter in the opening diameter of low-pressure side.

2. medium-pressure or high pressure device according to claim 1, it is characterised in that

Another cable connecting terminals housing at least includes the opening with cone shape in inner surface in the following manner, i.e., round
Cone diameter increases from internal to external, and at least inner surface of the circular cone of the opening is covered with conductive layer, and described
Resistive voltage divider is positioned in the following manner, i.e., described high-pressure side is placed on one with smaller internal diameter of terminal openings
Side, and the low-pressure side is placed on the larger diameter of terminal shell opening.

3. medium-pressure or high pressure device according to claim 1 or 2, it is characterised in that

For another cable connecting terminals in bus or isolator or the output section side of switchgear stem portion, being adjacent to should
Use the cable terminal of the operation cable connection of the bus or isolator or switchgear.

4. medium-pressure or high pressure device according to claim 1 or 2, it is characterised in that

The voltage sensor module is electrically connected to another cable connecting terminals.

5. medium-pressure or high pressure device according to claim 1 or 2, it is characterised in that